Consolidated Statements of Stockholders' Equity - USD ($) $ in Millions		Total	Common Stock	Treasury Stock	Additional Paid-In	Accumulated Deficit	Accumulated Other Comprehensive Income (Loss)
Beginning Balance (in shares) at Dec. 31, 2016			88,034,813	0
Beginning Balance at Dec. 31, 2016		$ 829.5	$ 0.8	$ 0.0	$ 1,470.3	$ (641.6)	$ 0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income		38.3				38.3
Stock based compensation expense (in shares)			53,177
Stock based compensation expense		10.2			10.2
Stock option exercises and other (in shares)			405,478	2,274
Stock option exercises and other		7.0	$ 0.1		6.9
Unrealized income (loss) resulting from change in fair value of derivative instruments, net of tax		(0.4)					(0.4)
Ending Balance (in shares) at Dec. 31, 2017			88,493,468	2,274
Ending Balance at Dec. 31, 2017		884.6	$ 0.9	$ 0.0	1,487.4	(603.3)	(0.4)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income		9.4				9.4
Stock based compensation expense (in shares)			22,565
Stock based compensation expense		11.2			11.2
Stock option exercises and other (in shares)			169,887
Stock option exercises and other		3.1			3.1
Unrealized income (loss) resulting from change in fair value of derivative instruments, net of tax		0.4					0.4
Ending Balance (in shares) at Dec. 31, 2018			88,685,920	2,274
Ending Balance at Dec. 31, 2018		911.5	$ 0.9	$ 0.0	1,501.7	(591.1)	0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income		(6.6)				(6.6)
Stock based compensation expense (in shares)			18,735
Stock based compensation expense		$ 10.0			10.0
Stock option exercises and other (in shares)		788,868	1,131,414
Stock option exercises and other		$ 16.0			16.0
Stock repurchases (in shares)	[1]			130,656
Stock repurchases	[1]	(4.1)		$ (4.1)
Unrealized loss resulting from change in fair value of derivative instruments, net of tax of $1.4		(3.4)					(3.4)
Ending Balance (in shares) at Dec. 31, 2019			89,836,069	132,930
Ending Balance at Dec. 31, 2019		923.4	$ 0.9	$ (4.1)	$ 1,527.7	(598.1)	(3.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Impact of implementing new revenue recognition standard, net of tax		$ 0.0				$ (0.4)	$ 0.4

[1] Stock repurchases represent shares withheld by the Company to pay employee taxes associated with performance stock unit vesting and restricted stock unit vesting.